partdesc.h File Reference

#include "partitioning/partdefs.h"
#include "utils/relcache.h"

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Data Structures
struct	PartitionDescData

Typedefs
typedef struct PartitionDescData	PartitionDescData

Functions
PartitionDesc	RelationGetPartitionDesc (Relation rel, bool omit_detached)
PartitionDirectory	CreatePartitionDirectory (MemoryContext mcxt, bool omit_detached)
PartitionDesc	PartitionDirectoryLookup (PartitionDirectory, Relation)
void	DestroyPartitionDirectory (PartitionDirectory pdir)
Oid	get_default_oid_from_partdesc (PartitionDesc partdesc)

Typedef Documentation

PartitionDescData

typedef struct PartitionDescData PartitionDescData

Function Documentation

CreatePartitionDirectory()

PartitionDirectory CreatePartitionDirectory	(	MemoryContext	mcxt,
		bool	omit_detached
	)

Definition at line 383 of file partdesc.c.

{
    MemoryContext oldcontext = MemoryContextSwitchTo(mcxt);
    PartitionDirectory pdir;
    HASHCTL     ctl;
 
    pdir = palloc(sizeof(PartitionDirectoryData));
    pdir->pdir_mcxt = mcxt;
 
    ctl.keysize = sizeof(Oid);
    ctl.entrysize = sizeof(PartitionDirectoryEntry);
    ctl.hcxt = mcxt;
 
    pdir->pdir_hash = hash_create("partition directory", 256, &ctl,
                                  HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
    pdir->omit_detached = omit_detached;
 
    MemoryContextSwitchTo(oldcontext);
    return pdir;
}

References HASHCTL::entrysize, HASH_BLOBS, HASH_CONTEXT, hash_create(), HASH_ELEM, HASHCTL::hcxt, HASHCTL::keysize, MemoryContextSwitchTo(), PartitionDirectoryData::omit_detached, palloc(), PartitionDirectoryData::pdir_hash, and PartitionDirectoryData::pdir_mcxt.

Referenced by CreatePartitionPruneState(), ExecInitPartitionDispatchInfo(), and set_relation_partition_info().

DestroyPartitionDirectory()

void DestroyPartitionDirectory

(

PartitionDirectory

pdir

)

Definition at line 444 of file partdesc.c.

{
    HASH_SEQ_STATUS status;
    PartitionDirectoryEntry *pde;
 
    hash_seq_init(&status, pdir->pdir_hash);
    while ((pde = hash_seq_search(&status)) != NULL)
        RelationDecrementReferenceCount(pde->rel);
}

References hash_seq_init(), hash_seq_search(), PartitionDirectoryData::pdir_hash, PartitionDirectoryEntry::rel, and RelationDecrementReferenceCount().

Referenced by FreeExecutorState(), and standard_planner().

get_default_oid_from_partdesc()

Oid get_default_oid_from_partdesc

(

PartitionDesc

partdesc

)

Definition at line 461 of file partdesc.c.

{
    if (partdesc && partdesc->boundinfo &&
        partition_bound_has_default(partdesc->boundinfo))
        return partdesc->oids[partdesc->boundinfo->default_index];
 
    return InvalidOid;
}

References PartitionDescData::boundinfo, PartitionBoundInfoData::default_index, InvalidOid, PartitionDescData::oids, and partition_bound_has_default.

Referenced by ATExecAttachPartition(), ATExecDetachPartition(), DefineRelation(), and StorePartitionBound().

PartitionDirectoryLookup()

PartitionDesc PartitionDirectoryLookup	(	PartitionDirectory	pdir,
		Relation	rel
	)

Definition at line 416 of file partdesc.c.

{
    PartitionDirectoryEntry *pde;
    Oid         relid = RelationGetRelid(rel);
    bool        found;
 
    pde = hash_search(pdir->pdir_hash, &relid, HASH_ENTER, &found);
    if (!found)
    {
        /*
         * We must keep a reference count on the relation so that the
         * PartitionDesc to which we are pointing can't get destroyed.
         */
        RelationIncrementReferenceCount(rel);
        pde->rel = rel;
        pde->pd = RelationGetPartitionDesc(rel, pdir->omit_detached);
        Assert(pde->pd != NULL);
    }
    return pde->pd;
}

References Assert(), HASH_ENTER, hash_search(), PartitionDirectoryData::omit_detached, PartitionDirectoryEntry::pd, PartitionDirectoryData::pdir_hash, PartitionDirectoryEntry::rel, RelationGetPartitionDesc(), RelationGetRelid, and RelationIncrementReferenceCount().

Referenced by CreatePartitionPruneState(), ExecInitPartitionDispatchInfo(), expand_partitioned_rtentry(), and set_relation_partition_info().

RelationGetPartitionDesc()

PartitionDesc RelationGetPartitionDesc	(	Relation	rel,
		bool	omit_detached
	)

Definition at line 72 of file partdesc.c.

{
    Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
 
    /*
     * If relcache has a partition descriptor, use that.  However, we can only
     * do so when we are asked to include all partitions including detached;
     * and also when we know that there are no detached partitions.
     *
     * If there is no active snapshot, detached partitions aren't omitted
     * either, so we can use the cached descriptor too in that case.
     */
    if (likely(rel->rd_partdesc &&
               (!rel->rd_partdesc->detached_exist || !omit_detached ||
                !ActiveSnapshotSet())))
        return rel->rd_partdesc;
 
    /*
     * If we're asked to omit detached partitions, we may be able to use a
     * cached descriptor too.  We determine that based on the pg_inherits.xmin
     * that was saved alongside that descriptor: if the xmin that was not in
     * progress for that active snapshot is also not in progress for the
     * current active snapshot, then we can use it.  Otherwise build one from
     * scratch.
     */
    if (omit_detached &&
        rel->rd_partdesc_nodetached &&
        ActiveSnapshotSet())
    {
        Snapshot    activesnap;
 
        Assert(TransactionIdIsValid(rel->rd_partdesc_nodetached_xmin));
        activesnap = GetActiveSnapshot();
 
        if (!XidInMVCCSnapshot(rel->rd_partdesc_nodetached_xmin, activesnap))
            return rel->rd_partdesc_nodetached;
    }
 
    return RelationBuildPartitionDesc(rel, omit_detached);
}

References ActiveSnapshotSet(), Assert(), PartitionDescData::detached_exist, GetActiveSnapshot(), likely, RelationData::rd_partdesc, RelationData::rd_partdesc_nodetached, RelationData::rd_partdesc_nodetached_xmin, RelationData::rd_rel, RelationBuildPartitionDesc(), TransactionIdIsValid, and XidInMVCCSnapshot().

Referenced by addFkRecurseReferenced(), addFkRecurseReferencing(), ATExecAttachPartition(), ATExecAttachPartitionIdx(), ATExecDetachPartition(), ATExecDropNotNull(), check_new_partition_bound(), CreateTriggerFiringOn(), DefineIndex(), DefineRelation(), EnableDisableTrigger(), get_qual_for_list(), get_qual_for_range(), PartitionDirectoryLookup(), QueuePartitionConstraintValidation(), renametrig(), renametrig_partition(), StorePartitionBound(), and validatePartitionedIndex().